Question about 2001 Toyota 4Runner
You can get this code if you don't tighten the gas cap all the way, or the gas cap is bad. I will put all the detail for the code below and what I would do to fix the problem...
NOTE: Do not top off your tank either. This could cause the 'overfill check valve' to fail, and could cause this code.
Definition of P0441: Evaporative Emission Control System Incorrect
DTCs P0441 and P0446 are recorded by the ECM when evaporative emissions leak from the emissions components
or when there is a malfunction in either the VSV for EVAP, the VSV for
pressure switching valve, or in the vapor pressure sensor itself.
detection cause: Pressure in charcoal canister and fuel tank does not drop or
drop in pressure increased beyond the specified limit during
purge control (2 trip detection logic)
What I would do:
1. Replace fuel cap and reset computer. If code returns, then proceed to next
The next steps require a diagram, so the purchase of service manual to locate the components is very helpful
2. Check for vacuum leaks in ALL emission hoses
3. Check VSV valve operation (there are three; they are ~$75 new from dealer, and sometimes fail)
4. Check for cracks or leaks around or in the charcoal canister (usually requires a smoke machine)
5. check for voltage to VSV's
6. Last resort: take it to the dealer and have them run a diagnosis. This should run between $50-$100.
Posted on Apr 15, 2010
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Posted on Jan 02, 2017
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